…1216)

## Summary

Follow-up to #1213. When auto-discovering a `tsconfig.json` for an
importer, `claims_ownership_of` treated *any* file the tsconfig doesn't
compile as "owned by the nearest tsconfig" and stopped the upward walk.
That blanket shortcut intercepted files that an ancestor project
genuinely owns.

## The problem

The guard was:

```rust
if !self.is_file_extension_allowed_in_tsconfig(path) {
    return true; // claimed by the nearest tsconfig
}
```

`is_file_extension_allowed_in_tsconfig` is true only for TS extensions
(and JS when `allowJs` is on), so the negation claimed **non-TS files**
(`.vue`, `.css`), **extensionless paths**, and **`allowJs`-off `.js`**
alike. Two concrete failures:

1. **Non-TS files don't reach their solution project.** A child
`tsconfig.json` including only `**/*.ts` would claim a sibling
`App.vue`. Auto-discovery stopped at the child, so a solution root that
references a config with `include: ["src/**/*.vue"]` and a `@/*` alias
never owned the file and the alias didn't resolve.
2. **`allowJs`-off `.js` leaks a referenced project's `paths`.** A
referenced project with `allowJs` off but `include: ["src/**/*.js"]`
would still route a `.js` importer through itself, applying its `@lib/*`
paths to a file TypeScript excludes from the program.

## The fix

- **`claims_ownership_of`** — narrow the early `return true` to
`path.extension().is_none()`. A directory (extensionless importer) isn't
a file, so `files`/`include` ownership doesn't apply and the nearest
enclosing tsconfig governs it (many discovery cases rely on its
`paths`/`baseUrl`/`extends`). A genuine file — including an
`allowJs`-off `.js` this config won't compile — is claimed only when
actually owned, otherwise the walk continues up.
- **`is_file_included_in_tsconfig`** — reject non-program inputs (an
`allowJs`-off `.js`, even when a glob names `.js`; or an extensionless
path) before consulting `include`, so `resolve_tsconfig_solution` won't
route such files to a referenced project.
- Extracted `is_extensionless_or_uncompiled_js` to share that predicate.

Directory importers are unchanged: they still resolve against their
nearest tsconfig (verified by the existing `tsconfig_discovery` cases).

## Tests

- `solution_style_nested_non_ts_walks_up` (new) — a child config
including only `**/*.ts` no longer intercepts `App.vue`; the walk
reaches the solution project that owns `@/*`. A `.ts` the child includes
stays on the child; an `allowJs`-off `legacy.js` walks up like the
`.vue`.
- `referenced_config_drops_js_when_allow_js_off` (new) — a `.ts`
importer resolves `@lib/*`; a `.js` importer does not (dropped because
`allowJs` is off).
- `solution_style_non_ts_extensions` (updated) — a `.css` matched by no
`include` walks past the solution root to the outermost ancestor, and
the `@/*` alias does not leak into it.

New fixtures under `fixtures/tsconfig/cases/referenced-allow-js-off/`
and `fixtures/tsconfig/cases/solution-style-non-ts/src/feature/`.

## 🤖 New release

* `oxc_resolver`: 11.21.0 -> 11.21.1
* `oxc_resolver_napi`: 11.21.0 -> 11.21.1

<details><summary><i><b>Changelog</b></i></summary><p>

## `oxc_resolver`

<blockquote>

##
[11.21.1](v11.21.0...v11.21.1)
- 2026-06-17

### <!-- 1 -->🐛 Bug Fixes

- *(tsconfig)* walk up for non-TS and `allowJs`-off `.js` importers
([#1216](#1216)) (by
@shulaoda)
- *(tsconfig)* honor explicit non-TS extensions in `include`
([#1213](#1213)) (by
@shulaoda)

### <!-- 2 -->🚜 Refactor

- *(cache)* replace papaya with dashmap
([#1214](#1214)) (by
@Boshen)

### <!-- 6 -->🧪 Testing

- verify node_modules canonicalization across layouts
([#1200](#1200)) (by
@Boshen)

### Contributors

* @shulaoda
* @Boshen
</blockquote>



</p></details>

---
This PR was generated with
[release-plz](https://github.com/release-plz/release-plz/).

Co-authored-by: oxc-guard[bot] <276638029+oxc-guard[bot]@users.noreply.github.com>

…9845)

Related to #9841

## What

Updates the `tsconfig` auto-discovery documentation (`packages/rolldown/src/options/docs/tsconfig.md`, injected into the `tsconfig` option's JSDoc) to reflect two oxc-resolver fixes that already ship in the version Rolldown uses (`11.21.3`).

## Why

The docs still described oxc-resolver's previous behavior, which no longer matches what the resolver does.

### 1. Fallback for unowned files (oxc-project/oxc-resolver#1220)

Previously, when no `tsconfig.json` owned a file, the resolver fell back to the outermost (topmost) ancestor `tsconfig.json`, leaking its `paths`/`baseUrl` to unrelated files. It now applies no config in that case (an inferred project with no path mapping), matching TypeScript and typescript-go.

Doc change:

> If no `tsconfig.json` owns the file, no config is applied (no `paths`/`baseUrl`), matching TypeScript.

### 2. Explicit non-TS extensions in `include` (oxc-project/oxc-resolver#1213)

The extension filter used to reject any non-TS/JS file up front, so an explicitly listed extension such as `src/**/*.vue` never matched. The filter now applies only to the default `**/*`-style globs: a bare/omitted `include` still matches only TS/JS, while an entry naming an explicit extension matches verbatim. This lets a `.vue` (or other non-TS) file pick up the project's `paths`/`baseUrl`.

This file-matching rule is general (it applies to both the root tsconfig and referenced projects), so it is now documented as a standalone paragraph instead of being buried in the `references` section:

> Whether a `files`/`include` entry matches a file depends on its extension: by default only TypeScript files (`.ts`/`.tsx`/`.mts`/`.cts`) match, plus `.js`/`.jsx`/`.mjs`/`.cjs` when `allowJs` is enabled. An entry that names an explicit extension (for example `src/**/*.vue`) matches that extension verbatim, so a non-TS file can be owned by the project and pick up its `paths`/`baseUrl`.

## [1.1.2] - 2026-06-18

### 📝 Notable tsconfig behavior changes

These ship via the `oxc_resolver` 11.21.3 bump (#9841) and affect `resolve.tsconfigPaths` (Vite 8 resolves through oxc-resolver):

- **Honor explicit non-TS extensions in `include`** (oxc-project/oxc-resolver#1213). `compilerOptions.paths` now resolve for importers whose extension is explicitly listed in a tsconfig's `include` (e.g. `src/**/*.vue`, `src/**/*.svelte`). Previously oxc-resolver filtered importers by extension before evaluating the `include` globs, so a `.vue`/`.svelte` file listed in `include` never matched its project and its `paths` were skipped. This unblocks the default create-vite Vue + TS layout (a solution-style root plus a referenced `tsconfig.app.json` that declares `paths` and `include: ["src/**/*.ts", "src/**/*.vue"]`). Matches vue-tsc and svelte-check, which register these extensions via TypeScript's `extraFileExtensions`.
- **No fallback to the outermost tsconfig in auto-discovery** (oxc-project/oxc-resolver#1220). Auto-discovery no longer attaches the topmost ancestor `tsconfig.json` to a file that no project actually owns (via `files` / `include` / project references). Previously such a file inherited the outermost ancestor's `paths` / `baseUrl`, leaking aliases into files that project does not own. oxc-resolver now returns no config in that case, matching tsserver / typescript-go, which route such files to an inferred project with no aliases.

### 🚀 Features

- add option named for invalid return type errors for more places (#9846) by @shulaoda
- add option names for invalid return type errors (#9821) by @sapphi-red
- transform: infer decorator strictNullChecks from tsconfig (#9590) by @kylecannon
- expose React Compiler options for rolldown and Vite users (#9801) by @Boshen
- tracing: gate chrome-json trace layer behind `chrome-tracing` feature (#9773) by @hyf0
- dev: align test-dev-server with Vite dev server (#9668) by @h-a-n-a

### 🐛 Bug Fixes

- plugin_timings: point doc link to existing checks reference page (#9837) by @hyf0
- generator: correct contradictory panic message in cjs cross-chunk symbol lookup (#9836) by @hyf0
- esm: preserve with clause on export * from external (#9796) by @hyf0
- Make external_import_binding_merger deterministic (#9755) by @naruaway
- surface invalid `manualCodeSplitting` group `test` regex as an error (#9792) by @shulaoda
- avoid panic on `output.file` without a file name (#9789) by @shulaoda
- avoid O(N^2) rendering of high-volume diagnostics (#9748) (#9749) by @IWANABETHATGUY
- avoid panic on JSON numbers outside f64 range (#9788) by @shulaoda
- deps: bump mimalloc-safe to 0.1.63 to fix worker_threads segfault (#9785) by @shulaoda
- cache ESM evaluation errors (#9784) by @sapphi-red
- wrap node require helper in pure IIFE (#9783) by @kb019
- lazy-barrel: load locally-used imports on a re-exported record (#9757) by @shulaoda
- avoid dangling wrapped-ESM init call across chunks (#9502) (#9717) by @IWANABETHATGUY
- dev: detect same-second rewrites in CI poll watcher (#9736) by @h-a-n-a
- dev: force rebuild after HMR errors (#9686) by @h-a-n-a
- dev: print build errors on browser refresh after a failed build (#9652) by @h-a-n-a

### 🚜 Refactor

- single-source the chunk $N symbol-naming algorithm (#9831) by @Dunqing
- simplify common_dir helper (#9857) by @IWANABETHATGUY
- drop commondir crate in favor of in-house helper (#9849) by @Boshen
- binding: extract helpers from normalize_binding_options (#9842) by @Boshen
- move rolldown_filter_analyzer to tasks and scope oxc cfg feature (#9839) by @Boshen
- options: merge manualCodeSplitting into codeSplitting object form (#9805) by @IWANABETHATGUY
- options: support codeSplitting object form in CodeSplittingMode (#9804) by @IWANABETHATGUY
- diagnostic: reuse ByteLocator for per-source line lookup (#9762) by @IWANABETHATGUY
- remove redundant Arc around tracing spans (#9778) by @camc314
- remove unnecessary `Arc` around sourcemap sender (#9777) by @camc314
- rolldown_plugin_vite_wasm_fallback: remove the plugin (#9775) by @sapphi-red
- binding: remove infer-able `napi(ts_type)` (#9737) by @sapphi-red
- remove preprocessor span dedup (#9734) by @hyf0
- identify AST nodes by NodeId instead of Span/Address (#9609) by @IWANABETHATGUY

### 📚 Documentation

- tsconfig: align auto-discovery docs with oxc-resolver behavior (#9845) by @shulaoda
- relocate meta/design to internal-docs, split design from implementation (#9826) by @h-a-n-a
- meta: add options normalization design doc (#9818) by @IWANABETHATGUY
- document why the napi tracing feature is enabled (#9766) by @Boshen
- dev: move test-dev-server test guidance into the testing docs (#9809) by @h-a-n-a

### ⚡ Performance

- drop unused regex unicode property tables from the binding (#9848) by @Boshen
- drop urlencoding crate in favor of percent-encoding (#9851) by @Boshen
- drop owo-colors supports-colors feature in vite reporter (#9824) by @Boshen
- skip enum member value extraction for non-TypeScript modules (#9840) by @shulaoda
- rolldown: use unstable sort for itertools sorted_by at unique-key sites (#9827) by @Boshen
- cheaper deterministic ordering in external import binding merger (#9810) by @IWANABETHATGUY
- disable idna's ICU backend by pinning idna_adapter to 1.0.0 (-129 KB) (#9811) by @Boshen
- size: use unstable sort where stability is unneeded (#9803) by @Boshen
- remove num-format dependency from vite reporter (#9795) by @Boshen
- reduce js callback error size (#9776) by @Boshen
- rolldown_error: remove Debug supertrait from BuildEvent (#9798) by @Boshen
- reduce plugin hook order code size (#9761) by @Boshen
- deps: disable `infer` default features to reduce binary size (#9765) by @Boshen
- reduce pluginable monomorphization size (#9771) by @Boshen
- avoid rebuilding replace plugin values (#9764) by @Boshen
- defer link-stage-output drop to rayon workers after output is produced (#9733) by @Brooooooklyn
- tree-shaking: hoist already-included guard to call sites in inclusion DFS (#9738) by @Brooooooklyn
- renamer: dedup before allocating the owned name in add_symbol_in_root_scope (#9740) by @Brooooooklyn

### 🧪 Testing

- allocs: track allocation counts for rolldown_sourcemap (#9835) by @hyf0
- bench: add CodSpeed micro-benchmarks for rolldown_sourcemap (#9834) by @hyf0
- add cjs named export mutation test (#9823) by @sapphi-red
- dev: restore shared-page reliability conventions in AGENTS.md (#9786) by @h-a-n-a
- dev: add `AGENTS.md` test guidance for agents (#9763) by @h-a-n-a
- dev: split out initial-build-error into its own playground (#9772) by @h-a-n-a
- dev: align e2e suite with Vite and parallelize playgrounds (#9759) by @h-a-n-a
- remove unnecessary module namespace object JSON serializations in tests (#9725) by @sapphi-red
- use `assert.deepStrictEqual` instead of `assert.deepEqual` by using `assert/strict` instead of `assert` (#9724) by @sapphi-red
- hmr: add test case for #5301 (#5302) by @sapphi-red
- dev: add tests for dev-engine principles (#9720) by @h-a-n-a
- dev: align dev-engine test harness with Vite (#9684) by @h-a-n-a

### ⚙️ Miscellaneous Tasks

- deps: update napi to 3.9.3 (#9862) by @shulaoda
- deps: update oxc to 0.137.0 (#9856) by @Boshen
- re-enable default lld linker on x86_64-unknown-linux-gnu (#9855) by @Boshen
- deps: bump vite-plus to 0.2.1 (#9850) by @Boshen
- skills: translate _config.json when encoding rolldown REPL links (#9847) by @IWANABETHATGUY
- deps: update oxc_resolver and oxc_resolver_napi to 11.21.3 (#9841) by @Boshen
- pin vite-plus (vp) CLI to 0.1.24 in setup-vp (#9830) by @Boshen
- add crate/package-level CODEOWNERS (#9819) by @IWANABETHATGUY
- drop unused derive_more display feature from rolldown_plugin (#9820) by @Boshen
- remove auto-assign PR workflow (#9807) by @IWANABETHATGUY
- deps: update rollup submodule for tests to v4.62.0 (#9780) by @rolldown-guard[bot]
- deps: update esbuild for tests to 0.28.1 (#9779) by @rolldown-guard[bot]
- deps: update test262 submodule for tests (#9781) by @rolldown-guard[bot]
- deps: update oxc to 0.136.0 (#9770) by @Boshen
- add pull request template (#9756) by @sapphi-red
- clarify `rolldown_plugin_vite_*` is compatible for the same minor (#9774) by @sapphi-red
- deps: update github actions (#9745) by @renovate[bot]
- deps: update rust crates (#9747) by @renovate[bot]
- deps: update napi to v3.9.2 (#9744) by @renovate[bot]
- deps: update npm packages (#9746) by @renovate[bot]
- deps: update @napi-rs/cli and emnapi deps (#9741) by @Brooooooklyn
- generator: fix `vp fmt` on Windows (#9727) by @sapphi-red
- ban importing from `assert` and recommend `assert/strict` (#9726) by @sapphi-red

### ❤️ New Contributors

* @naruaway made their first contribution in [#9755](#9755)
* @kb019 made their first contribution in [#9783](#9783)

Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>